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Existence of positive periodic solutions of mutualism systems with several delays. (English) Zbl 1134.34323

By using the coincidence degree, the author studies the global existence of positive periodic solutions for a class of mutualism systems with several delays and obtains a new and interesting criterion.

MSC:

34K13 Periodic solutions to functional-differential equations
92D25 Population dynamics (general)
92B05 General biology and biomathematics
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